Guidance regarding Direct Entry Scheme of CA

I intend to pursue Chartered Accountant course, after inquiry I understand that postgraduates with 55% and above can (completed M.Com. - 61%) directly register to IPC examination.

Presently I am working as Office Assistant in a Central Government Organization at Bangalore and confirmation due by the end of September / October 2014. As per rules of the organisation I am eligible for study leave only after completion of continuous service for 5 years. Hence kindly clarify some queries in this regard:
1. To register for IPC examination
- the last date for registration to take exams in May 2015
- is there any age, time limit and also no. of maximum attempts to complete
- can I take up exam for group 1 in May 2015 and another group by May 2016
- is there any time schedule to register for articleship after completion of IPC exams

2. After clearing of IPC exam, registering for Articleship for 3 years is mandatory. As per our leave rules study leave is granted only for 28 months.

As I already have a permanent job I have time to complete. Kindly clarify my doubts and guide me in opting CA.